Level III: as rx'd. Level II and Level I:1:30 of double-under attempts. If you get to 50 before time is up, move on to 1:30 of sit-ups. If you get to 50 before time is up, move on to 1:15 of double-under attempts. If you get to 40 before time is up, move on to 1:15 of sit-ups. If you get to 40 before time is up, move on to 1:00 of double-under attempts. If you get to 30 before time is up, move on to 1:00 of sit-ups. If you get to 30 before time is up, move on to :45 of double-under attempts. If you get to 20 before time is up, move on to :45 of sit-ups. If you get to 20 before time is up, move on to :30 of double-under attempts. If you get to 10 before time is up, move on to :30 of sit-ups. If you get to 10 before time is up, you're done.If you complete the assigned work before time is up, move to the next exercise, always trying to stay ahead of the clock. If not, record how many double-unders and sit-ups you got.